use in gwt

I'm developing a large-ish web application using the Google Web Toolkit (GWT) and one of the things I'd like to integrate is a wiki. I'd like to use an existing wiki engine and not develop from scratch, and in looking around it seems that xwiki is the best java solution. So, here are my questions: 1) Has anyone integrated xwiki into an existing GWT application? 2) And if not, has anyone integrated xwiki into any other existing java web application? Some guidance on how to approach this would be appreciated (high level is okay, I'll sweat the details), if it is indeed agreed that xwiki is an appropriate solution. Thanks- Robert